Upload Files

I have a few interpretive questions on uploading files. There is the max_input_time, and the max_execution_time. I am uploading files and they continue to time out after a few minutes. Looking at the php.ini file from phpinfo() shows max_input_time set to -1 and max_execution_time set to 60. Does the max_execution_time have anything to do with the timeout, or is it all in the max_input_time? And does the "-1" value mean run indefinitely (until the file is uploaded)? Is there any function that will change that value? Any clarifications on this would be helpful. Stuart